The compound which has one isopropyl group is :

$\Delta_{\text {vap }} \mathrm{H}-\Delta_{\text {vap }} \mathrm{U}=...... \times 10^{2} \,\mathrm{~J}\, \mathrm{~mol}^{-1}$. (Round off to the NearestInteger)

$\left[\right.$ Use : $\left.R=8.31\, \mathrm{~J}\, \mathrm{~mol}^{-1}\, \mathrm{~K}^{-1}\right]$

[Assume volume of $\mathrm{H}_{2} \mathrm{O}(\mathrm{l})$ is much smaller than volume of $\mathrm{H}_{2} \mathrm{O}(\mathrm{g})$. Assume $\mathrm{H}_{2} \mathrm{O}(\mathrm{g})$ treated as an ideal gas]

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What will be the ratio of wavelength of third line of Balmer series in $H{e^ \oplus }$ ion spectrum to the first line of balmer series in $Li^{+2}$ ion spectrum

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The number of molecule at $NTP$ in $1\, ml$ of an ideal gas will be

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The correct order of second $I.E$ of $C, N, O$ and $F$ are in order

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In an atom, an electron is moving with a speed of $600 \,m/s$ with an accuracy of $0.005\%.$ Certainity with which the position of the electron can be located is $( h =6.6 \times 10^{-34} \,kg\, m^2s^{-1},$ mass of electron, $e_m= 9.1 \times 10^{-31}\, kg)$ :

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The equilibrium $PC{l_5}_{(g)\,}\, \rightleftharpoons \,PC{l_3}_{(g)} + \,C{l_{2(g)}}$ shows that $K_P\,(atm)$ is double to the value of $K_C$ $(mol/litre)$ at a particular temperature $T,$ then $T$ is ......$K$

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Enthalpy of sublimation of a substance is equal to,